Data recording apparatus for managing content when content is deleted

Abstract

A data recording apparatus capable of properly managing contents of data and reproduction information even if a portion of the data is deleted. If a portion of Clip is deleted so that an ATC-sequence becomes discontinuous, the value of offset_STC_id for an STC-sequence at the beginning of the ATC-sequence is set so that the value of stc_id of each STC-sequence following the ATC discontinuity does not change. The stc_id of an STC-sequence is an ID for identifying the STC-sequence.

1. A data recording apparatus for recording a data stream including an array of packets onto an information recording medium, comprising:
 first detection means for detecting reference-time information of said data stream; 
 first generation means for generating:
 first continuity information representing continuity of first time information generated on the basis of a detection result produced by said first detection means; 
 second continuity information representing continuity of second time information showing arrival times of said packets; 
 identification information for identifying a first packet array including no discontinuity of said first time information; and 
 an offset value of said identification information offset value added for each second packet array including no discontinuity of said second time information; and 
 
 recording means for recording said first continuity information, said second continuity information and said offset value onto said information recording medium. 
 
     
     
       2. A data recording apparatus according to  claim 1 , wherein said first continuity information represents an address of a packet at a start of a time axis for said first time information in a recorded packet array. 
     
     
       3. A data recording apparatus according to  claim 1 , wherein said second continuity information represents an address of a packet at a start of a time axis for said second time information in a recorded packet array. 
     
     
       4. A data recording apparatus according to  claim 1 , further comprising management means for managing data so that said first packet array does not extend over a boundary of said second packet array. 
     
     
       5. A data recording apparatus according to  claim 1 , said data recording apparatus further comprising:
 second detection means for detecting a change point of program contents included in said data stream; and 
 acquisition means for acquiring an address of a packet corresponding to a change point of program contents in a recorded packet array on the basis of a detection result produced by said second detection means, 
 wherein said recording means records an address of a packet corresponding to a change point acquired by said acquisition means onto said information recording medium. 
 
     
     
       6. A data recording apparatus according to  claim 5 , further comprising management means for managing data so that, in a recorded packet array, one program-sequence may extend over a boundary between said first packet array and said second packet array where said program-sequence is an array of packets with fixed program contents. 
     
     
       7. A data recording apparatus according to  claim 1 , further comprising second generation means for generating a presentation start time and a presentation end time for each of said arrays of first packets,
 wherein said recording means records said presentation start time and said presentation end time, generated by said second generation means. 
 
     
     
       8. A data recording apparatus according to  claim 7 , wherein said recording means records a map showing a relation between times of display-time information and data addresses. 
     
     
       9. A data recording method adopted in a data recording apparatus for recording a data stream including an array of packets onto an information recording medium, comprising:
 a first detection step of detecting reference-time information of said data stream; 
 a generation step of generating:
 first continuity information representing continuity of first time information generated on the basis of a detection result produced in processing carried out at said first detection step; 
 second continuity information representing continuity of second time information showing arrival times of said packets; 
 identification information for identifying a first packet array including no discontinuity of said reference-time information; and 
 an offset value of said identification information added for each second packet array including no discontinuity of said second time information; and 
 
 a recording step of recording said first continuity information, said second continuity information and said offset value onto said information recording medium. 
 
     
     
       10. A computer-readable medium storing an encoded program that when executed causes a processor to execute the steps of:
 a first detection step of detecting reference-time information of said data stream; 
 a generation step of generating:
 first continuity information representing continuity of first time information generated on the basis of a detection result produced in processing carried out at said first detection step; 
 second continuity information representing continuity of second time information showing arrival times of said packets; 
 identification information for identifying a first packet array including no discontinuity of said reference-time information; and 
 an offset value of said identification information added for each second packet array including no discontinuity of said second time information; and 
 
 a recording step of recording said first continuity information, said second continuity information and said offset value onto said information recording medium.